Question

我有订单和产品型号 "Order" HasMany产品（和产品属于订单）......

假设我要显示订单的3个产品，怎么做？我知道第一个可以检索$order->products->first() ...但是如何检索第二个和第三个产品？

我试过$order->products->find(1)但是“1”代表产品的ID ...我不想知道......

Answer 1

我终于找到了解决方案，这是正确的语法：

 $order->products->get(0)->name;   will return the first record
 $order->products->get(1)->name;   will return the second record
 $order->products->get(2)->name;   will return the third record

等等......

Answer 2

$order->products()->skip(1)->first();//Second row
$order->products()->skip(2)->first();//Third row
....

比装载所有产品更有效率，只获得第一，第二，ecc ..

Answer 3

你可以试试这个：

$order->products->take(3)->get();

Answer 4

说您想从Eloquent Collection购买第二个产品

如果您确定数组键与数组索引相同，请执行

$order->products->get(1)->name;

如果您需要第二项并且不确定数组键，请执行此操作

$order->products->slice(1, 1)->first()->name;

Answer 5

$order->products()->skip(1)->take(1)->first(); //Second row
$order->products()->skip(2)->take(1)->first(); //Third row

$order->products()->orderBy('salary','desc')->skip(1)->take(1)->first(); //Second highest salary row
$order->products()->orderBy('salary','desc')->skip(2)->take(1)->first(); //Third highest salary row

Laravel Eloquent如何获得第二或第三个记录？

5 个答案: